All done now. So here is the promised write up. Tools needed: T25 torx driver (short shaft is best) Torch Stereo release keys (4 if fitting a nav unit) Steps: 1) Remove both side under dash panels by removing the two screws underneath and the screws behind the dash end trims. 2) Remove old stereo and trim piece around hazard switch Slide out climate control unit. You will now see all the torx screws to be removed. 3) Remove the 2 screws at the top, 4 on the front and also there are 2 on either side near the back of the trim. 4) The trim will now pull forward allowing you to disconnect the electrical connections and remove. 5) This will now reveal the inner cage which is held in my a screw either side. Remove the screws and the cage will lift out. 6)Run your GPS antennae connection to the rear if the stereo and locate the receiver end up into the dash cavity. As high up as you can so it has a clear as possible line up through the windscreen. If your also fitting TMC or TV tuner as well run the cables into the stereo area now. 7) Now it's just a case of fitting new double din parts in reverse of the above. 8) Once you have refitted all the dash panels you will be ready to install the nav unit. This is just a case of plugging in all the connections and sliding the unit in. One thing to note on the install is that the RNS-D required a 'safe' feed wire. This was simply a wire linked from the permanent live to the safe connection as shown on the wiring sticker On mine it was the red and white cable linked into the plug hole next to it. Notes: Don't tighten the new inner cage until you have lined up the outer trim. When fitting the outer trim locate the base first and it will go back in a lot easier. Finished result All in all it is not a difficult or long job. It's taken me about two hours and I have done that in the dark (only spare time I could get) To set up all the features of the nav unit you will need access to vcds to code it in. I will add a link to the coding info below. If you have any questions or would like extra help just let me know.